Five days that changed the course of history.

The Collyer brothers holed up inside their house for more than a decade, amassing 120 tons of junk that ultimately killed them.

Man's best friend may also be deer's best friend.

Colonia Dignidad operated for decades — and saw horrific acts of abuse transpire within it.

One of the most effective uses of this technology was in solving a double murder in North Carolina.

For years, the C.I.A. both used these techniques at home and taught them to oppressive foreign dictators.

The true story of Béla Kiss, the Hungarian serial killer who killed at least 23 women and drained their blood.

The rare antique was found at a Romanian flea market for 100 euros.

A great-great grandson of American serial killer H.H. Holmes says that his ancestor was Jack the Ripper.

In 1933, Nazis burned 2,000 books they found "subversive." A conceptual artist has just built a Parthenon of banned books where the burning took place.

These vintage mugshots allow us to see both the horror and humanity in the faces of criminals from the 19th and early 20th centuries.